Cover for dental drill handpieces



Nov. 13, 1928.

W. OGiLVlE COVER FOR DENTAL DRILL HANDPIEQES 2 Sheets-Sheet 1 Filed Jan. 13, 1927 Nov. 13, 1928. 1,691,823

w. OGILVIE COVER FOR DENTAL DRILL HANDPIECES Filed Jan; 13, 1927 2 Sheets-Sheet 2 k time Patented Nov. 13, 1928.

1 1,691,823 r OFFICE.

"ATEN WiLIiIAM oerrivrn, or EDGEGLIFF, SYDNEY, new scorn WALES, AUSTRALIA.

COVER FOR DENTAL DRILL HANDPIECES.

Application filed January '13, 1927, Seria1 No.,160,968, andin Australia March 23,1926.

'l/Vhen a dental handpiece is used in the practice ofv dentistry it becomes more or less coated with saliva from. the patients mouth,

and to avoid the risk of infection being conveyed thereby to a succeeding patient it is necessary to sterilize the handpiece. This is usually done by immersing it in boiling water or in a sterilizing fluid either of which penetrates to the working parts of the handpiece and to some extent at least, if not totally, destroys the lubricant, so that before it is again used fresh lubricant must be applied. Another method of sterilizing is to subject the hand-piece to the action of sterilizing vapour, and even this has a drying effeet on the lubricant. In any case the sterilization and preparation of the handpiece for reuse occupies an appreciable length of time, and it is usual for a dentist to have a supply of handpieces so that while one is being sterilized another may be fitted to the dental engine.

The object of this invention is to render unnecessary the sterilization of the handpiece, or at least the whole of it, on ever I occasion after it has been used on a patient, and my invention consists in a tubular cover or sheath adapted to neatly fit the handpiece and formed with an aperture to register withthe socket of the handpiece which re ceives the shank of the operative tool orbit, said shank being a neat fit in said aperture. This cover which may be of thin metal, celluloid, waterproofed paper or other suitable aseptic material, protects the handpiece from the saliva, and after use may itself be sterilized while a substituted one is fitted to the same handpiece, or it maybe discarded.

For a straight handpiecethat is, one in which the bit is in axial alignment with the axis of the handpiece-the sheath or cover is made in one piece with the aperture to receive the shank of the bit at the outer end, and preferably formed at its other end to make a bayonet joint connection with a radially For an angle handpiece-that is, one in which the bit projects at an angle from the side of the handpiece, the cover or sheath is in two parts, one telescoping on or in the other, and one of said parts having a longitudinal slot permitting it to be adjusted after the bit has been fitted to the handpiece. In another form of telescopic sheath one of the parts is formed with a gapor aperture pertion fitted to av straight handpiece, part of the l cover being broken away to disclose the hand piece,

Fig. 2 shows the cover by itself,

F 1g. 3 shows an angle handpiece fitted with a telescopic cover,

Fig. 4 shows the telescopic cover per se with the parts separated, and

Fig. 5 a part section thereof with portion of the handpiece shown in dotted lines.

F 1g. 6 shows an alternative form of telescopic cover fitted to an angle handpiece.

Iiig. 7 the cover per se with parts separated, anc

Fig. 8 a section of. the cover shown in Fig. it with, contained handpiece shown in dotted mes.

Referring to Figs. 1 and 2, the cover A is of a shape conforming to that of the handpiece B shown mainly in dotted lines in Fig. 1 and at its front and smaller end has an aperture C through which the bit D is inserted into the handpiece in the usual way. This cover may be made of such good i will grip the handpiece sufiiciently and not require any other holding means, in which case it need not extend to the rear end of the handpiece; but as a safeguard against dis-v placement, the rear end of the cover. as shown is formed with an angle slot E engaging a pin F projecting from the handpiece and usually provided thereon for a purpose well known.

Referring to Figs. 3, 4 and 5, the cover is formed in two parts A and A part A being a plain tube slidable on the handpiece and part A constituting a cap making a tight sliding fit on part A and formed with a slot G. In adjusting this form of cover, the part A is first placed on the handpiece and so positioned that the lever B of the bit holding clip (shown in dotted lines in Fig. 5) is exposed for manipulation,the bit D is then fitted and the part A moved to abut against it; the cap A 'is then fitted on as shown in Figs. 3 and 5.

Referring to Figs. 6, 7 and 8, the construction shown permits the fitting of the bit D after the cap A is positioned on the handsliding fit that it F piece. The cap A is made to fit Within the part .A and is formed with an aperture J Which permits manipulation of the clip lever B when fitting or releasing the bit D which is passed through the aperture C in the cap.

When the parts are adjusted the part A covers the aperture J. V p

In all forms of my invention the material of which the coveris made is (preferably) sufiieiently thin and flexible to permit it to be squeezed by the fingers of theoperator on to the handpieee so that the latter Will not turn in the cover.

VVhatI claim and desire to secure by Letters Patent is r A cover for a dental drill handpiece con-- sisting of two mutually telescoping tubular parts of suitable aseptic material, one of said parts being open at both ends and the other closed at one end and formed with an aperture registering with the drill socket in the handpiece whenthe parts'are adjusted thereon. I p

1 Signed at Sydney, New South Wales, this I tenth day of December, A. D. 1926.

' WILLIAM OG'ILVIE. 

